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johngrantuk/ExampleEthers.js Secret

Last active Sep 6, 2020
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import { ethers, utils } from 'ethers';
let provider = new ethers.providers.JsonRpcProvider('https://kovan.infura.io/v3/your_key');
const abi = []; // https://ethereumdev.io/abi-for-erc20-contract-on-ethereum/
test('network sanity check', async () => {
let network = await provider.getNetwork();
expect(network.chainId).toEqual(42);
});
test('Confirm correct on-chain data DAI (18 decimals)', async () => {
const daiKovanAddr = '0x1528F3FCc26d13F7079325Fb78D9442607781c8C';
const tokenContract = new ethers.Contract(daiKovanAddr, abi, provider); // See bottom of page for abi
const tokenSymbol = await tokenContract.symbol();
const tokenDecimals = await tokenContract.decimals();
expect(tokenSymbol).toEqual('DAI');
expect(tokenDecimals).toEqual(18);
});
test('Confirm correct on-chain data USDC (6 decimals)', async () => {
const usdcKovanAddr = '0x2F375e94FC336Cdec2Dc0cCB5277FE59CBf1cAe5';
const tokenContract = new ethers.Contract(usdcKovanAddr, abi, provider);
const tokenSymbol = await tokenContract.symbol();
const tokenDecimals = await tokenContract.decimals();
expect(tokenSymbol).toEqual('USDC');
expect(tokenDecimals).toEqual(6);
});
test('Confirm checksum address conversion', async () => {
const nonCheckSumAddr = '0xd115bffabbdd893a6f7cea402e7338643ced44a6';
const checkSumAddr = utils.getAddress(nonCheckSumAddr);
expect(checkSumAddr).toEqual('0xD115BFFAbbdd893A6f7ceA402e7338643Ced44a6');
expect(nonCheckSumAddr).not.toBe(
'0xD115BFFAbbdd893A6f7ceA402e7338643Ced44a6'
);
});
test('Invalid checksum address conversion', async () => {
const nonCheckSumAddr = '0xD115BFfabbdd893a6f7cea402E7338643ced44a6';
let checkSumAddr;
try {
checkSumAddr = utils.getAddress(nonCheckSumAddr);
} catch {
checkSumAddr = false;
}
expect(checkSumAddr).toEqual(false);
});
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